Shadow’s End by S.C. Wynne

Will this be the end of my war with Steven Pine? Or just the end of me?

Psychic Liam Baker and his boyfriend Detective Kimball Thompson have battled the murderous and terrifyingly powerful psychic, Steven Pine twice now. Both men would love to put that chapter to rest. Unfortunately, when Steven manages to escape police custody, he immediately goes to work murdering innocents. It seems Steven’s happiest when taunting Liam with the spirits of his prey.
Thompson and Liam follow the trail of victims, well aware that Steven is setting a dangerous trap for them. What Thompson doesn’t realize is that Liam has decided that there will be no fourth battle with Steven.
Even if Liam has to personally escort Steven Pine to Hell.